如何產生連續時間?(案例)

原問題以下：

 

 

Insus.NET的問題解決，分2步，1，建立一個輔助表，2，合併數據。

程式碼搜尋出來如圖：

 

IF OBJECT_ID(N'TEMPDB.DBO.#search_data') IS NOT NULL
DROP TABLE #search_data
GO
 
CREATE TABLE #search_data ([times] DATETIME,[val] INT)
 
INSERT INTO #search_data ([times],[val]) VALUES
('2001-01-01 00:00:00',13),
('2001-01-01 00:10:00',22),
('2001-01-01 00:20:00',31),
('2001-01-01 00:40:00',5 ),
('2001-01-01 00:50:00',64),
('2001-01-01 02:30:00',73),
('2001-01-01 04:10:00',63),
('2001-01-01 04:50:00',12),
('2001-01-01 06:30:00',32)
 

Source Code

 

 

接下來，咱們能夠建立一張輔助表：

 

 

DECLARE @start_datetime DATETIME = '2000-01-01 00:00:00',
        @end_datetime DATETIME  = '2000-02-01 00:00:00'

;WITH DTs([times]) 
AS
(
    SELECT  @start_datetime
    UNION ALL
    SELECT [times] = DATEADD(MINUTE,10, [times])
    FROM [DTs]
    WHERE [times] < @end_datetime
)
SELECT [times] FROM [DTs] OPTION (MaxRecursion 0)

Source Code

 

總共產生4465行記錄。

更多相關輔助表，能夠參考《使用CTE生成輔助表(數字或時間)等》http://www.javashuo.com/article/p-pycytexv-ep.html 和《快速生成基數的輔助表》http://www.javashuo.com/article/p-pycytexv-ep.html

 

爲了更好操做，把輔助表的產生數據存入一張臨時表中：

 

IF OBJECT_ID(N'TEMPDB.DBO.#base') IS NOT NULL
    DROP TABLE #base
GO
 
CREATE TABLE #base ([times] DATETIME)

DECLARE @start_datetime DATETIME = '2000-01-01 00:00:00',
        @end_datetime DATETIME  = '2000-02-01 00:00:00'
;WITH DTs([times]) 
AS
(
    SELECT  @start_datetime
    UNION ALL
    SELECT [times] = DATEADD(MINUTE,10, [times])
    FROM [DTs]
    WHERE [times] < @end_datetime
)

INSERT INTO #base ([times]) SELECT [times] FROM [DTs] OPTION (MaxRecursion 0)

Source Code

 

第2步，合併數據，把程序搜索結果與輔助表的數據進行合併merge:

 

MERGE #search_data AS Target
    USING (SELECT [times] FROM #base) AS Source
    ON (Target.[times] = Source.[times])
 
    WHEN NOT MATCHED BY TARGET THEN
        INSERT ([times],[val]) VALUES ([times],0);  

SELECT [times],[val] FROM #search_data

Source Code

 

OK，實現方法僅供參考，完整代碼：

IF OBJECT_ID(N'TEMPDB.DBO.#search_data') IS NOT NULL
DROP TABLE #search_data
GO
 
CREATE TABLE #search_data ([times] DATETIME,[val] INT)
 
INSERT INTO #search_data ([times],[val]) VALUES
('2001-01-01 00:00:00',13),
('2001-01-01 00:10:00',22),
('2001-01-01 00:20:00',31),
('2001-01-01 00:40:00',5 ),
('2001-01-01 00:50:00',64),
('2001-01-01 02:30:00',73),
('2001-01-01 04:10:00',63),
('2001-01-01 04:50:00',12),
('2001-01-01 06:30:00',32)
 
 
 
IF OBJECT_ID(N'TEMPDB.DBO.#base') IS NOT NULL
    DROP TABLE #base
GO
 
CREATE TABLE #base ([times] DATETIME)

DECLARE @start_datetime DATETIME = '2000-01-01 00:00:00',
        @end_datetime DATETIME  = '2000-02-01 00:00:00'
;WITH DTs([times]) 
AS
(
    SELECT  @start_datetime
    UNION ALL
    SELECT [times] = DATEADD(MINUTE,10, [times])
    FROM [DTs]
    WHERE [times] < @end_datetime
)

INSERT INTO #base ([times]) SELECT [times] FROM [DTs] OPTION (MaxRecursion 0)



MERGE #search_data AS Target
    USING (SELECT [times] FROM #base) AS Source
    ON (Target.[times] = Source.[times])
 
    WHEN NOT MATCHED BY TARGET THEN
        INSERT ([times],[val]) VALUES ([times],0);  

SELECT [times],[val] FROM #search_data

Source Code